diff -Naur Python-2.7.9-orig/Lib/compileall.py Python-2.7.9/Lib/compileall.py
--- Python-2.7.9-orig/Lib/compileall.py	2014-12-10 18:59:33.000000000 +0300
+++ Python-2.7.9/Lib/compileall.py	2014-12-11 13:50:57.377000000 +0300
@@ -42,6 +42,8 @@
     success = 1
     for name in names:
         fullname = os.path.join(dir, name)
+        if sys.platform == "win32" and sys.version.find("GCC") >= 0:
+            fullname = fullname.replace('\\','/')
         if ddir is not None:
             dfile = os.path.join(ddir, name)
         else: